Minister of Fire2.

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You can burn any type of wood, as long as it is dry (seasoned) enough. Two years is enough if the wood is split and stacked, but no amount of time is enough on the bottom of a pile on the ground. I guess the stuff on top of the pile is fine, the stuff in contact with the ground is wet or rotten. The stuff in between the top and bottom could go either way, and the closer to the top the better it will be.